From c51b66ebcace2adec0cfbe42d25cb418ed0c02a2 Mon Sep 17 00:00:00 2001 From: DRC Date: Fri, 20 Jul 2018 17:21:36 -0500 Subject: [PATCH] cjpeg: Fix OOB read caused by malformed 8-bit BMP ... in which one or more of the color indices is out of range for the number of palette entries. Fix partly borrowed from jpeg-9c. This commit also adopts Guido's JERR_PPM_OUTOFRANGE enum value in lieu of our project-specific JERR_PPM_TOOLARGE enum value. Fixes #258 --- cderror.h | 5 +++-- rdbmp.c | 7 ++++++- rdppm.c | 4 ++-- 3 files changed, 11 insertions(+), 5 deletions(-) diff --git a/cderror.h b/cderror.h index d69b501..46b0f49 100644 --- a/cderror.h +++ b/cderror.h @@ -2,7 +2,7 @@ * cderror.h * * Copyright (C) 1994-1997, Thomas G. Lane. - * Modified 2009 by Guido Vollbeding. + * Modified 2009-2017 by Guido Vollbeding. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * @@ -48,6 +48,7 @@ JMESSAGE(JERR_BMP_COLORSPACE, "BMP output must be grayscale or RGB") JMESSAGE(JERR_BMP_COMPRESSED, "Sorry, compressed BMPs not yet supported") JMESSAGE(JERR_BMP_EMPTY, "Empty BMP image") JMESSAGE(JERR_BMP_NOT, "Not a BMP file - does not start with BM") +JMESSAGE(JERR_BMP_OUTOFRANGE, "Numeric value out of range in BMP file") JMESSAGE(JTRC_BMP, "%ux%u 24-bit BMP image") JMESSAGE(JTRC_BMP_MAPPED, "%ux%u 8-bit colormapped BMP image") JMESSAGE(JTRC_BMP_OS2, "%ux%u 24-bit OS2 BMP image") @@ -74,8 +75,8 @@ JMESSAGE(JWRN_GIF_NOMOREDATA, "Ran out of GIF bits") #ifdef PPM_SUPPORTED JMESSAGE(JERR_PPM_COLORSPACE, "PPM output must be grayscale or RGB") JMESSAGE(JERR_PPM_NONNUMERIC, "Nonnumeric data in PPM file") -JMESSAGE(JERR_PPM_TOOLARGE, "Integer value too large in PPM file") JMESSAGE(JERR_PPM_NOT, "Not a PPM/PGM file") +JMESSAGE(JERR_PPM_OUTOFRANGE, "Numeric value out of range in PPM file") JMESSAGE(JTRC_PGM, "%ux%u PGM image") JMESSAGE(JTRC_PGM_TEXT, "%ux%u text PGM image") JMESSAGE(JTRC_PPM, "%ux%u PPM image") diff --git a/rdbmp.c b/rdbmp.c index c053074..7a27cab 100644 --- a/rdbmp.c +++ b/rdbmp.c @@ -3,7 +3,7 @@ * * This file was part of the Independent JPEG Group's software: * Copyright (C) 1994-1996, Thomas G. Lane. - * Modified 2009-2010 by Guido Vollbeding. + * Modified 2009-2017 by Guido Vollbeding. * Modifications: * Modified 2011 by Siarhei Siamashka. * For conditions of distribution and use, see the accompanying README file. @@ -64,6 +64,7 @@ typedef struct _bmp_source_struct { JDIMENSION row_width; /* Physical width of scanlines in file */ int bits_per_pixel; /* remembers 8- or 24-bit format */ + int cmap_length; /* colormap length */ } bmp_source_struct; @@ -124,6 +125,7 @@ get_8bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) { bmp_source_ptr source = (bmp_source_ptr) sinfo; register JSAMPARRAY colormap = source->colormap; + int cmaplen = source->cmap_length; JSAMPARRAY image_ptr; register int t; register JSAMPROW inptr, outptr; @@ -140,6 +142,8 @@ get_8bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) outptr = source->pub.buffer[0]; for (col = cinfo->image_width; col > 0; col--) { t = GETJSAMPLE(*inptr++); + if (t >= cmaplen) + ERREXIT(cinfo, JERR_BMP_OUTOFRANGE); *outptr++ = colormap[0][t]; /* can omit GETJSAMPLE() safely */ *outptr++ = colormap[1][t]; *outptr++ = colormap[2][t]; @@ -399,6 +403,7 @@ start_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) source->colormap = (*cinfo->mem->alloc_sarray) ((j_common_ptr) cinfo, JPOOL_IMAGE, (JDIMENSION) biClrUsed, (JDIMENSION) 3); + source->cmap_length = (int)biClrUsed; /* and read it from the file */ read_colormap(source, (int) biClrUsed, mapentrysize); /* account for size of colormap */ diff --git a/rdppm.c b/rdppm.c index 5da1646..59da2bb 100644 --- a/rdppm.c +++ b/rdppm.c @@ -76,7 +76,7 @@ typedef struct { JSAMPROW pixrow; /* FAR pointer to same */ size_t buffer_width; /* width of I/O buffer */ JSAMPLE *rescale; /* => maxval-remapping array, or NULL */ - int maxval; + unsigned int maxval; } ppm_source_struct; typedef ppm_source_struct * ppm_source_ptr; @@ -126,7 +126,7 @@ read_pbm_integer (j_compress_ptr cinfo, FILE * infile, int maxval) } if (val > maxval) - ERREXIT(cinfo, JERR_PPM_TOOLARGE); + ERREXIT(cinfo, JERR_PPM_OUTOFRANGE); return val; } -- 2.17.2